| Electronics > Beginners |
| My e-cig died. |
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| Mechatrommer:
--- Quote from: thm_w on May 10, 2018, 12:05:20 am ---Building your own circuit is good for learning but as you say.. --- End quote --- better be off building constant current load or adjustable SMPS, they are about the same topology and cost hundreds if not thousands ready made. an adjustable e-cig mod with mcu and small lcd is like what? $30? i've dismantled mine... not for the faint heart ed, at that cost... |
| paulca:
A good eCig, like an Inokin Coolfire provides: Constant voltage, boosted as high as 30V. Constant Wattage, boosted as high as 40W (some vape mods get as high as 100W) Auto-timeout at 10 seconds to prevent overheating in your pocket if you accidentally press the button. Everything is controlled via an oLED screen and three buttons. It also provides USB charging and "pass through vaping", so you can still vape while it's charging. Constant voltage works by the resistance of the coil and ohms law as to what you get. I prefer using constant wattage. I don't sub-ohm vape, so I'm working on somewhere between 7 and 10 Watts. There are however reports from some coil vendors that Innokin products have a tendency to spike current before they recover to regulated amount, but I found it was only those manufacturers coils that burnt, so I don't really believe them. I could put my Coolfire through a 2 Ohm resistor and scope it I suppose. Making your own of similar quality in a small form factor would not be easy to say the least, you need a boost circuit, an 18650 power path charger, a current limiter, a constant voltage limiter, a wattage calculated current limiter, oLED screen and MCU, timeout override circuit etc. In the Coolfire the completely board including oLED is 1cm x 5cm double side populated. |
| sstepane:
I can even elaborate a bit on the subject. There are mods for 1 to 4 cells, 50 to 300W. Almost all of them are, basically, boost converters consisting of 1 or 2 half bridge mosfet drivers and 2 to 5 mosfets (80-150A rated). All cell replaceable mods do have at least reverse polarity protection (either p-channel or n-channel mosfet), overheating protection (thermoresistor or even two) and some of them even have a thermocouple placed near a battery. Charging circuits utilize special ics starting with TP4056 and up to BQ76925 (which is quite a sophitsticated one). |
| mikerj:
--- Quote from: sstepane on May 09, 2018, 08:11:22 pm ---It's the same as to ride a 4-wheeled combustible filled tank which is ignited by a spark. --- End quote --- It's quite literally not the same. |
| sstepane:
--- Quote from: mikerj on May 10, 2018, 12:21:04 pm --- --- Quote from: sstepane on May 09, 2018, 08:11:22 pm ---It's the same as to ride a 4-wheeled combustible filled tank which is ignited by a spark. --- End quote --- It's quite literally not the same. --- End quote --- Ok. I can rephrase - potentially dangerous device equipped with safety measures for everyday use. How close it is to any other device out there is a matter of taste really. |
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